Nationally recognized computational biology authority Lewis Chodosh, MD, PhD, from the Pennsylvania School of Medicine, will speak May 22, at a retreat hosted by the molecular and cell physiology departmentís systems biology and physiology program. The retreat, at the Genome Research Institute, 2180 E. Galbraith Rd., Reading, will demonstrate the fusion of concepts from many disciplines, including biology, computer science, applied mathematics, physics and engineering, that converge to form systems biology and physiology.